.maindiv .left {
    position: fixed;
    top: 60px;
    height: 714px;
    width: 190px;
    background-color: rgb(52, 55, 68);
    box-sizing: border-box;
    padding: 47px 15px 0px;
    color: white;
    font-size: 14px;
}

.active {
    background-color: rgb(77, 77, 77);
}

.activeClick {
    z-index: 100;
    background-color: rgb(227, 227, 227);
    color: #343744;
}
.left div ul li {
    height: 42px;
    line-height: 42px;
    border-radius: 10px;
    padding-left: 17px;
    margin-bottom: 20px;
}
